Process for preparing composite inorganic membranes

Details Process for preparing composite inorganic membranes Process for preparing composite inorganic membranes

1999-06-30

2001-05-08

Beck, Shrive (Department: 1762)

Coating processes

Coating by vapor, gas, or smoke

Metal coating

C427S255260, C427S255600

Reexamination Certificate

active

06228426

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a process for preparing a composite inorganic membrane and more particularly, to the process for preparing a composite inorganic membrane with excellent combination of properties such as permeation on specific gases and mechanical property, wherein an organometallic compound expressed by the following formula 1 is deposited on the surface of a porous supporter and then a reductive gas is passed through the opposite side of the supporter to form a metal film at room temperature; if deemed necessary, a mixture of the organometallic compound and organosilver compound expressed by the formula 2 is employed to prepare the composite inorganic membrane with the following merits: (1) the pores can be more compacted, (2) permeability for a specific gas during gas separation is excellent with better mechanical property, (3) the composite inorganic membrane can be more compacted due to the thermal treatment at a high temperature, (4) energy saving effects are visible due to the thermal treatment at a lower temperature than the conventional composite inorganic membrane, and (5) the membrane of the present invention is applicable as an excellent dehydrogenation catalyst on the organic compounds.
M[allyl][cyclopentadienyl]  (1)
Where, M represents Pd, Nb, or Ni.
Ag[C
6
H
4
CH
3
]  (2)
DESCRIPTION OF THE RELATED ART
A palladium composite inorganic membrane, which is currently commercialized, is prepared in such a manner that palladium or an alloy of palladium/silver (23%) is coated on the porous supporter in the thickness of more than 30 &mgr;m. However, the composite membrane has a poor permeability on hydrogen due to its large thickness of membrane, thus being efficiently inapplicable in any membrane reactor requiring a lot of fast reactions, except for the small scale purification of hydrogen. Under such circumstances, there is urgent need for developing a process for preparing more ultra-thin inorganic membranes.
To overcome such shortcomings, many researchers have recently focused on the formation of the composite membrane having the thickness of 1 &mgr;m via nucleation based on atomic or molecular units. Thus, various methods such as sputtering and chemical sputter-deposition method has been reported but these methods have yet to be commercialized, since more compact membrane cannot be obtained due to a plasticizing effect of a membrane formed at a very high temperature.
SUMMARY OF THE INVENTION
To solve above-mentioned problems, the objective of present invention is to supply a process for preparing composite inorganic membranes which have excellent mechanical property and permeability for a specific gas by depositing organometallic compounds, expressed by the formula 1, onto the surface of a porous supporter and streaming reductive gas on the opposite side in order to form metal film on the supporter surface, if necessary, have enhanced gas compactness by filling up fine pores in the membrane using said organometallic compounds with organosilver compounds expressed by the formula 2, especially can have high compactness and can be heat-treated at relatively low temperature after the heat-treatment of the supporter coated with said metal film at high temperature, and therefore can have energy saving effect and application to dehydrogenating catalysts for spot-lightened organic compounds.


REFERENCES:
patent: 5215943 (1993-06-01), Anderson et al.
patent: 5468819 (1995-11-01), Goodall et al.
Chang-Soo Jun et al., “Preparation of palladium membranes from the reaction of Pd(C3H3)(C5H5) with H2: wet-impregnated deposition,”Journal of Membrane Science, vol. 157, pp. 107-115 (May, 1999).

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